High-per-cent. salvarsan emulsion.



,No Drawing.

rinrrnn STATES PATENT orrron.

CARL SCHINDLEB, 0F BERLIN-SCHfiNEBERG, GERMANY.

HIGH-PER-CEITT. SALVARSAIN EMULSION.

To all whom it may concern:

Be it. known that I, CARL SCHINDLER, av subject of the German Emperor, and residing at Berlin-Schiineberg, Germany, have invented certainnew and useful Improvements in High-Per-Cent. Salvarsan Emulsions, of which the following is a specification. j

The present invention has reference to an improved process of preparing high -'percent. sterile oil emulsions of organic arseni- Well known disadvantages.

highly oxi'dizable it must be kept 1n evacu;

cal compounds, and relates more especially to the preparation of an oil emulslon of the dioxydiaminoarsenobenzene, termed salvars an; and the object of the invention is to do away with the many objections attaching to the preparation, use and effects of the arsenic compounds now used, in combatting infectious diseases, mainly syphilis.

Salvarsan as such and the mode of its application and its after-effects showseveral Since it is ated containers. For the same reason the aqueous solutions, in which it is now administered, -must always be freshly prepared,

.since they do not keep for any length of:

time. The concentratwn, in which these aqueous solutions are used, necessarily is relatively low, so that large volumes must be injected .in order to introduce the requ red amount of active substance.v Owing to the irritating properties of the substance the injection causes great, often excruciating pain. To meet these ob ections, it has been proposed to employ an oily suspension obtained by means of paraffin oil. However,

the results were in no Wise satisfactory.

Paraflin oil is capable of incorporating but relatively small quantities of the powder and the obtained suspension does not keep well, the suspended salvarsan soon dropping to the bottom again Furthermore, to preism and can be determined in the body after Specification of Letters Patent.

salvarsan:0.6 gram, be specially sterilized.

Patented Jan. 28; 1913.

Application filed July 5,1911. Serial No. 636,922.

15 years and more, and that it causes great pain and occasions'infiltrations, it would appear that paraffin is a very unsuitable medium for such injections.

According to the present invention I obtain high-per-cent. sterile oil emulsions of salvarsan and similar organic arsenical compounds which show none of the above;

described objections.-

The invention essentially consists in em ploying for the emulsification of the salvarsan sesame oil and especially iodic sesam oil. It seems that sesame oil has a pronounced aliinity to salvarsan. Thus, sesame oil has the capability of readily taking-up 1 the active substance in large quantities, so

that for suspending 0.6 gram of salvarsan only 3-3% cubic centimeters o-f oil are required. The oil very quickly incorporates been found to answer the purpose, for the reason that the oil as such is not ste'rileand first must be sterilized, and then because the oil in-the open market is not of absolutely uniform, reliable quality, so that its nature and properties must always first be determined. I now have discovered that all these the salvarsan and suspends it so well that only after a considerable period of time i does it drop to the bottom. The pure sesame oil-salvarsan' suspension, however, we not objections can be overcome by employing in place of. the pure, sesame oil the iodizd sesame oil, known as iodipin This body appears to be preeminently appropriate for the incorporation of salvarsan, of which 50-60% are taken upjby theoil without la-T borious trituration. At the-same time theemulsion is so complete that even after Weeks and months no appreciable sediment will show. Yet in spite of this high percentage of salvarsan the preparation fon slight heating becomesso liquid that it can readily be injected through fine-syringes;

A moderate-addition ofasolid fatty substance, such as lanolin, sutlices to congeal the preparation for shipment. and storage purposes. Iodipin, moreover, has the advantage 'of being itself a bactericide, and it transmits this property to the salva'rsan emulsion, so that the preparation need not The technical advantages of new preparation thus are the followingz(l) 114) An extraordinary high percentage of sal- 'varsan can be incorporated and be held in finest homogeneous emulsion, without a dealkali iodin,

posit being formed 'even after a 'oonsiderab e length of time (-2) The ac-- solid fatty substance,

tive substance is incorporated very quickly without tedious trit-uration. 3)o-Absolu esterility. 1) Sufficient liqui ity to pass through the finestsyringe 'needlesr 5)= Con ealment at ordinary ten perature after admixture of inconsiderable amounts "of a and consequent .econ- 0m since durlng shipment and storage not mg mus along the glassand adheres thereto and the contents canbeiextrafc'ted'to the very last; a matter of mportance when the, high price of compound is "consid- Q ered-v The medicaladVantageS are the followingz- -(l) The compound never causes in- J filtrations and; necrosis of the tissues and also nopain on injection. The necesforefl (3 sor edw 2 I; iodin and thereby aids fs'alvarsan,

1 V also would account for the complete emulsion of the preparation in the, animal body.

(63 An-extraordinarily effective iodic arseni is formed in the body by the detach ment of the iodin. Since this setting-free oes on continuouslygthough rather slowly,

4 it is belieyed f'and numerous experiments Land tests have strengthened this belief, that injurious efiects following the use of such arsenic compounds are not to be feared, on

A acc ount of which theseotherwise highly eflietheran absolutely homogeneous finegrained powder results. This 'mass, which cacious compounds so far have not been introduced into therapeutics. a ZIn preparing'the new compound, by. way of examplegl grams of salvarsan are satur'ated in an agate bowl with about 15 drops of ethyl ether and then well ground and ,triturat ed, so that after evaporation of the at first was rather voluminous, coarse grained and difficult to grind, by this treat- ;ment wit-hether is greatlycompacted and its fine grain now readily forms with relatively smallamounts of oil an unguentous body in which a high percentage of the mass is contained as active'constituent. The ether in no wise alters or affects the powder, while alcohol would at-once render it lumpy. This pie-treatment with ether, therefore, forms an essential partof the process. The powder obtained 1n this -manner is now heaped up in the middle of the'bowl, so that 'no particlesremain adheringto the walls,

of a 25% iodipin, 1'; cubic c'entimeter'of a 10% iodipin, and"0.5 cubic. centimeter of anhydrous lanolinisadded. This is done by letting a few drops ofthe ,oil fall from ing the rest from the side against the powder oil ring, for the'purpo'se of preventing any of the powder from'being'miscarried. The

the oil ring by meansof a sterilized, slender and pointed glass rod'or a pestle into a homogeneous, unctuous' mass, which upon is then airtightlydnclosed'in small sterile flasks or tubes, w ich may also beevaciiated,

to the consistency of a salve ora solid fat.

For use the container is dipped for a few seconds into hotwater or swiftly drawn through a Bunsen flame, when complete liquefaction takes place, without the homogeneity of the emulsion being interfered with. The oil is then aspirated from-the opened flask with a suitable syringe and injected in well known manner.

What I claim is my signature in presence of twowitnesses. 1

Witnesses:

FELIX LUTZE; WERNER LUTZE.

Copies of this patent may be obtained forr five cents each, by addressingthe" f Commissioner of Patents, a .Washington, D O. 1 v r v so that 'the entire mass is surrounded byan' CARL scriiunLE t ii anda heated mixture of 5 cubic centimeters above onto the powder heap and then pourbowl is thenpla'ced in the water bath and i the powder is carefully 'tritu'r'ated' within continued manipulation finally assumes unifonn,liqu id'state. This liquid oil emulsion and in which the emulsion then congeals As a new compound, an emulsion of di-- 

